The base of a cone is always a circle.
it also can be a ellipse.
Cone
It is circular
cone
It is a cone.
When a cone is sliced, the shape formed depends on the angle of the cut. If the cut is parallel to the base of the cone, a circular shape is formed. If the cut is made at an angle to the base, an ellipse is created. A vertical slice through the apex and down the side will result in a triangular shape.
Cone
A circle.
2 sides, the base and the cone.
A plane circular shape.
A cone.
It is circular
The shape described by the intersection of the cone and the plane is simply a circle.
A cone
cone
It is a cone.
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Cone